133 lines
4.4 KiB
C++
133 lines
4.4 KiB
C++
// Ceres Solver - A fast non-linear least squares minimizer
|
|
// Copyright 2015 Google Inc. All rights reserved.
|
|
// http://ceres-solver.org/
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright notice,
|
|
// this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above copyright notice,
|
|
// this list of conditions and the following disclaimer in the documentation
|
|
// and/or other materials provided with the distribution.
|
|
// * Neither the name of Google Inc. nor the names of its contributors may be
|
|
// used to endorse or promote products derived from this software without
|
|
// specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
// POSSIBILITY OF SUCH DAMAGE.
|
|
//
|
|
// Author: Sameer Agarwal (sameeragarwal@google.com)
|
|
|
|
// This include must come before any #ifndef check on Ceres compile options.
|
|
#include "ceres/internal/port.h"
|
|
|
|
#ifndef CERES_NO_SUITESPARSE
|
|
|
|
#include "ceres/single_linkage_clustering.h"
|
|
|
|
#include "ceres/collections_port.h"
|
|
#include "ceres/graph.h"
|
|
#include "gtest/gtest.h"
|
|
|
|
namespace ceres {
|
|
namespace internal {
|
|
|
|
TEST(SingleLinkageClustering, GraphHasTwoComponents) {
|
|
WeightedGraph<int> graph;
|
|
const int kNumVertices = 6;
|
|
for (int i = 0; i < kNumVertices; ++i) {
|
|
graph.AddVertex(i);
|
|
}
|
|
// Graph structure:
|
|
//
|
|
// 0-1-2-3 4-5
|
|
graph.AddEdge(0, 1, 1.0);
|
|
graph.AddEdge(1, 2, 1.0);
|
|
graph.AddEdge(2, 3, 1.0);
|
|
graph.AddEdge(4, 5, 1.0);
|
|
|
|
SingleLinkageClusteringOptions options;
|
|
HashMap<int, int> membership;
|
|
ComputeSingleLinkageClustering(options, graph, &membership);
|
|
EXPECT_EQ(membership.size(), kNumVertices);
|
|
|
|
EXPECT_EQ(membership[1], membership[0]);
|
|
EXPECT_EQ(membership[2], membership[0]);
|
|
EXPECT_EQ(membership[3], membership[0]);
|
|
EXPECT_NE(membership[4], membership[0]);
|
|
EXPECT_NE(membership[5], membership[0]);
|
|
EXPECT_EQ(membership[4], membership[5]);
|
|
}
|
|
|
|
TEST(SingleLinkageClustering, ComponentWithWeakLink) {
|
|
WeightedGraph<int> graph;
|
|
const int kNumVertices = 6;
|
|
for (int i = 0; i < kNumVertices; ++i) {
|
|
graph.AddVertex(i);
|
|
}
|
|
// Graph structure:
|
|
//
|
|
// 0-1-2-3 4-5
|
|
graph.AddEdge(0, 1, 1.0);
|
|
graph.AddEdge(1, 2, 1.0);
|
|
graph.AddEdge(2, 3, 1.0);
|
|
|
|
// This component should break up into two.
|
|
graph.AddEdge(4, 5, 0.5);
|
|
|
|
SingleLinkageClusteringOptions options;
|
|
HashMap<int, int> membership;
|
|
ComputeSingleLinkageClustering(options, graph, &membership);
|
|
EXPECT_EQ(membership.size(), kNumVertices);
|
|
|
|
EXPECT_EQ(membership[1], membership[0]);
|
|
EXPECT_EQ(membership[2], membership[0]);
|
|
EXPECT_EQ(membership[3], membership[0]);
|
|
EXPECT_NE(membership[4], membership[0]);
|
|
EXPECT_NE(membership[5], membership[0]);
|
|
EXPECT_NE(membership[4], membership[5]);
|
|
}
|
|
|
|
TEST(SingleLinkageClustering, ComponentWithWeakLinkAndStrongLink) {
|
|
WeightedGraph<int> graph;
|
|
const int kNumVertices = 6;
|
|
for (int i = 0; i < kNumVertices; ++i) {
|
|
graph.AddVertex(i);
|
|
}
|
|
// Graph structure:
|
|
//
|
|
// 0-1-2-3 4-5
|
|
graph.AddEdge(0, 1, 1.0);
|
|
graph.AddEdge(1, 2, 1.0);
|
|
graph.AddEdge(2, 3, 0.5); // Weak link
|
|
graph.AddEdge(0, 3, 1.0);
|
|
|
|
// This component should break up into two.
|
|
graph.AddEdge(4, 5, 1.0);
|
|
|
|
SingleLinkageClusteringOptions options;
|
|
HashMap<int, int> membership;
|
|
ComputeSingleLinkageClustering(options, graph, &membership);
|
|
EXPECT_EQ(membership.size(), kNumVertices);
|
|
|
|
EXPECT_EQ(membership[1], membership[0]);
|
|
EXPECT_EQ(membership[2], membership[0]);
|
|
EXPECT_EQ(membership[3], membership[0]);
|
|
EXPECT_EQ(membership[4], membership[5]);
|
|
}
|
|
|
|
} // namespace internal
|
|
} // namespace ceres
|
|
|
|
#endif // CERES_NO_SUITESPARSE
|